Consolidated Statements Of Partners' Capital (USD $) In Millions, unless otherwise specified	Total	General Partner's Interests	Common Units	Class B Common Units
Partners' capital at Dec. 31, 2010	$ 210.0	$ 0.9	$ 208.5	$ 0.6
Increase (Decrease) in Partners' Capital
Net earnings	508.0	219.4	283.6	5.0
Distributions	(448.7)	(186.9)	(257.3)	(4.5)
Partners' capital at Dec. 31, 2011	269.3	33.4	234.8	1.1
Increase (Decrease) in Partners' Capital
Net earnings	560.8	239.7	315.6	5.5
Distributions	(558.3)	(240.8)	(312.1)	(5.4)
Partners' capital at Dec. 31, 2012	271.8	32.3	238.3	1.2
Increase (Decrease) in Partners' Capital
Net earnings	502.4	205.7	291.8	4.9
Distributions	(465.2)	(195.0)	(265.6)	(4.6)
Partners' capital at Dec. 31, 2013	$ 309.0	$ 43.0	$ 264.5	$ 1.5